Hmm... Does the cd light even switch on when you turn the computer on to say its activated?

If it doesn't it could be the fact the IDE cable is on the wrong way round.
Just try switching this around so that it is twisted the right way and place it back again. Some IDE cables have a marker or something so you know which way its meant to go into the drive.

It could be the bit going to the drive, or the bit going into the motherboard, so check both, because if its the wrong way, i'd expect the IDE cable to look twisted.

I hope this helps, and hopefully it'll then boot.

I also think that Windows 2000 booted automatically and didn't need a bootdisc